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Robust analysis of design in vibration of turbomachines

Abstract : In the context of turbomachinery design, a small variation in the blade characteristics due to manufacturing tolerances can affect the structural symmetry creating mistuning which increases the forced response. However, it is possible to detune the mistuned system in order to reduce the forced response amplification. This paper presents a robustness analysis of mistuning for a given detuning in blade geometry. Detuning is performed by modifying blade shapes. The different types of blades, obtained by those modifications, are then distributed on the disk circumference. A new reducedorder model of the detuned disk is introduced. It is based on the use of the cyclic modes of the different sectors which can be obtained from a usual cyclic symmetry modal analysis. Finally, the robustness of the computational model responses with respect to uncertainties, is performed with a stochastic analysis using a nonparametric probabilistic approach of uncertainties which allows both the system-parameter uncertainties and the modeling errors to be taken into account.
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Submitted on : Friday, October 19, 2012 - 5:08:41 PM
Last modification on : Thursday, March 19, 2020 - 11:52:03 AM
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M. Mbaye, Christian Soize, J.-P. Ousty, Evangéline Capiez-Lernout. Robust analysis of design in vibration of turbomachines. ASME Journal of Turbomachinery, 2013, 135 (2), pp.021008-1-8. ⟨10.1115/1.4007442⟩. ⟨hal-00743712⟩

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